HELP THIS IS FOR A TEST Edward drove 275 miles in 2 hours and 357.5 miles in 3 hours. If he drove at a constant rate, how much distance did he travel 1 4 every hour? ​

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?